السلام عليكم ورحمة الله وبركاته احسن الله إليك 1) After the nikah ceremony has taken place is it permissible for the groom to recite some Qurān and give a reminder or is this considered a bidah. 2) If it was done before the nikah took place would it be a bidah.

Ustadh AbdulAziz al-Haqqan

If you mean reciting the fatihah for example before the marriage this is a bid'ah. But if you mean he will say khutbat alhajjah including the ayat usually mentioned with it, then this is the sunnah.